drivers/net/ixgb/ixgb_main.c

   1 /*******************************************************************************
   2
   3
   4   Copyright(c) 1999 - 2005 Intel Corporation. All rights reserved.
   5
   6   This program is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU General Public License as published by the Free
   8   Software Foundation; either version 2 of the License, or (at your option)
   9   any later version.
  10
  11   This program is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14   more details.
  15
  16   You should have received a copy of the GNU General Public License along with
  17   this program; if not, write to the Free Software Foundation, Inc., 59
  18   Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20   The full GNU General Public License is included in this distribution in the
  21   file called LICENSE.
  22
  23   Contact Information:
  24   Linux NICS <linux.nics@intel.com>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgb.h"
  30
  31 /* Change Log
  32  * 1.0.96 04/19/05
  33  * - Make needlessly global code static -- bunk@stusta.de
  34  * - ethtool cleanup -- shemminger@osdl.org
  35  * - Support for MODULE_VERSION -- linville@tuxdriver.com
  36  * - add skb_header_cloned check to the tso path -- herbert@apana.org.au
  37  * 1.0.88 01/05/05
  38  * - include fix to the condition that determines when to quit NAPI - Robert Olsson
  39  * - use netif_poll_{disable/enable} to synchronize between NAPI and i/f up/down
  40  * 1.0.84 10/26/04
  41  * - reset buffer_info->dma in Tx resource cleanup logic
  42  * 1.0.83 10/12/04
  43  * - sparse cleanup - shemminger@osdl.org
  44  * - fix tx resource cleanup logic
  45  */
  46
  47 char ixgb_driver_name[] = "ixgb";
  48 static char ixgb_driver_string[] = "Intel(R) PRO/10GbE Network Driver";
  49
  50 #ifndef CONFIG_IXGB_NAPI
  51 #define DRIVERNAPI
  52 #else
  53 #define DRIVERNAPI "-NAPI"
  54 #endif
  55 #define DRV_VERSION             "1.0.104-k4"DRIVERNAPI
  56 char ixgb_driver_version[] = DRV_VERSION;
  57 static char ixgb_copyright[] = "Copyright (c) 1999-2005 Intel Corporation.";
  58
  59 /* ixgb_pci_tbl - PCI Device ID Table
  60  *
  61  * Wildcard entries (PCI_ANY_ID) should come last
  62  * Last entry must be all 0s
  63  *
  64  * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
  65  *   Class, Class Mask, private data (not used) }
  66  */
  67 static struct pci_device_id ixgb_pci_tbl[] = {
  68         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX,
  69          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  70         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_CX4,
  71          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  72         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_SR,
  73          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  74         {INTEL_VENDOR_ID, IXGB_DEVICE_ID_82597EX_LR,
  75          PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
  76
  77         /* required last entry */
  78         {0,}
  79 };
  80
  81 MODULE_DEVICE_TABLE(pci, ixgb_pci_tbl);
  82
  83 /* Local Function Prototypes */
  84
  85 int ixgb_up(struct ixgb_adapter *adapter);
  86 void ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog);
  87 void ixgb_reset(struct ixgb_adapter *adapter);
  88 int ixgb_setup_tx_resources(struct ixgb_adapter *adapter);
  89 int ixgb_setup_rx_resources(struct ixgb_adapter *adapter);
  90 void ixgb_free_tx_resources(struct ixgb_adapter *adapter);
  91 void ixgb_free_rx_resources(struct ixgb_adapter *adapter);
  92 void ixgb_update_stats(struct ixgb_adapter *adapter);
  93
  94 static int ixgb_init_module(void);
  95 static void ixgb_exit_module(void);
  96 static int ixgb_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
  97 static void __devexit ixgb_remove(struct pci_dev *pdev);
  98 static int ixgb_sw_init(struct ixgb_adapter *adapter);
  99 static int ixgb_open(struct net_device *netdev);
 100 static int ixgb_close(struct net_device *netdev);
 101 static void ixgb_configure_tx(struct ixgb_adapter *adapter);
 102 static void ixgb_configure_rx(struct ixgb_adapter *adapter);
 103 static void ixgb_setup_rctl(struct ixgb_adapter *adapter);
 104 static void ixgb_clean_tx_ring(struct ixgb_adapter *adapter);
 105 static void ixgb_clean_rx_ring(struct ixgb_adapter *adapter);
 106 static void ixgb_set_multi(struct net_device *netdev);
 107 static void ixgb_watchdog(unsigned long data);
 108 static int ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
 109 static struct net_device_stats *ixgb_get_stats(struct net_device *netdev);
 110 static int ixgb_change_mtu(struct net_device *netdev, int new_mtu);
 111 static int ixgb_set_mac(struct net_device *netdev, void *p);
 112 static irqreturn_t ixgb_intr(int irq, void *data, struct pt_regs *regs);
 113 static boolean_t ixgb_clean_tx_irq(struct ixgb_adapter *adapter);
 114
 115 #ifdef CONFIG_IXGB_NAPI
 116 static int ixgb_clean(struct net_device *netdev, int *budget);
 117 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter,
 118                                    int *work_done, int work_to_do);
 119 #else
 120 static boolean_t ixgb_clean_rx_irq(struct ixgb_adapter *adapter);
 121 #endif
 122 static void ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter);
 123 void ixgb_set_ethtool_ops(struct net_device *netdev);
 124 static void ixgb_tx_timeout(struct net_device *dev);
 125 static void ixgb_tx_timeout_task(struct net_device *dev);
 126 static void ixgb_vlan_rx_register(struct net_device *netdev,
 127                                   struct vlan_group *grp);
 128 static void ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid);
 129 static void ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid);
 130 static void ixgb_restore_vlan(struct ixgb_adapter *adapter);
 131
 132 #ifdef CONFIG_NET_POLL_CONTROLLER
 133 /* for netdump / net console */
 134 static void ixgb_netpoll(struct net_device *dev);
 135 #endif
 136
 137 /* Exported from other modules */
 138
 139 extern void ixgb_check_options(struct ixgb_adapter *adapter);
 140
 141 static struct pci_driver ixgb_driver = {
 142         .name     = ixgb_driver_name,
 143         .id_table = ixgb_pci_tbl,
 144         .probe    = ixgb_probe,
 145         .remove   = __devexit_p(ixgb_remove),
 146 };
 147
 148 MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
 149 MODULE_DESCRIPTION("Intel(R) PRO/10GbE Network Driver");
 150 MODULE_LICENSE("GPL");
 151 MODULE_VERSION(DRV_VERSION);
 152
 153 #define DEFAULT_DEBUG_LEVEL_SHIFT 3
 154 static int debug = DEFAULT_DEBUG_LEVEL_SHIFT;
 155 module_param(debug, int, 0);
 156 MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
 157
 158 /* some defines for controlling descriptor fetches in h/w */
 159 #define RXDCTL_WTHRESH_DEFAULT 16       /* chip writes back at this many or RXT0 */
 160 #define RXDCTL_PTHRESH_DEFAULT 0                /* chip considers prefech below
 161                                                  * this */
 162 #define RXDCTL_HTHRESH_DEFAULT 0                /* chip will only prefetch if tail
 163                                                  * is pushed this many descriptors
 164                                                  * from head */
 165
 166 /**
 167  * ixgb_init_module - Driver Registration Routine
 168  *
 169  * ixgb_init_module is the first routine called when the driver is
 170  * loaded. All it does is register with the PCI subsystem.
 171  **/
 172
 173 static int __init
 174 ixgb_init_module(void)
 175 {
 176         printk(KERN_INFO "%s - version %s\n",
 177                ixgb_driver_string, ixgb_driver_version);
 178
 179         printk(KERN_INFO "%s\n", ixgb_copyright);
 180
 181         return pci_module_init(&ixgb_driver);
 182 }
 183
 184 module_init(ixgb_init_module);
 185
 186 /**
 187  * ixgb_exit_module - Driver Exit Cleanup Routine
 188  *
 189  * ixgb_exit_module is called just before the driver is removed
 190  * from memory.
 191  **/
 192
 193 static void __exit
 194 ixgb_exit_module(void)
 195 {
 196         pci_unregister_driver(&ixgb_driver);
 197 }
 198
 199 module_exit(ixgb_exit_module);
 200
 201 /**
 202  * ixgb_irq_disable - Mask off interrupt generation on the NIC
 203  * @adapter: board private structure
 204  **/
 205
 206 static void
 207 ixgb_irq_disable(struct ixgb_adapter *adapter)
 208 {
 209         atomic_inc(&adapter->irq_sem);
 210         IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
 211         IXGB_WRITE_FLUSH(&adapter->hw);
 212         synchronize_irq(adapter->pdev->irq);
 213 }
 214
 215 /**
 216  * ixgb_irq_enable - Enable default interrupt generation settings
 217  * @adapter: board private structure
 218  **/
 219
 220 static void
 221 ixgb_irq_enable(struct ixgb_adapter *adapter)
 222 {
 223         if(atomic_dec_and_test(&adapter->irq_sem)) {
 224                 IXGB_WRITE_REG(&adapter->hw, IMS,
 225                                IXGB_INT_RXT0 | IXGB_INT_RXDMT0 | IXGB_INT_TXDW |
 226                                IXGB_INT_LSC);
 227                 IXGB_WRITE_FLUSH(&adapter->hw);
 228         }
 229 }
 230
 231 int
 232 ixgb_up(struct ixgb_adapter *adapter)
 233 {
 234         struct net_device *netdev = adapter->netdev;
 235         int err;
 236         int max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 237         struct ixgb_hw *hw = &adapter->hw;
 238
 239         /* hardware has been reset, we need to reload some things */
 240
 241         ixgb_rar_set(hw, netdev->dev_addr, 0);
 242         ixgb_set_multi(netdev);
 243
 244         ixgb_restore_vlan(adapter);
 245
 246         ixgb_configure_tx(adapter);
 247         ixgb_setup_rctl(adapter);
 248         ixgb_configure_rx(adapter);
 249         ixgb_alloc_rx_buffers(adapter);
 250
 251         /* disable interrupts and get the hardware into a known state */
 252         IXGB_WRITE_REG(&adapter->hw, IMC, 0xffffffff);
 253
 254 #ifdef CONFIG_PCI_MSI
 255         {
 256         boolean_t pcix = (IXGB_READ_REG(&adapter->hw, STATUS) &
 257                                                   IXGB_STATUS_PCIX_MODE) ? TRUE : FALSE;
 258         adapter->have_msi = TRUE;
 259
 260         if (!pcix)
 261            adapter->have_msi = FALSE;
 262         else if((err = pci_enable_msi(adapter->pdev))) {
 263                 DPRINTK(PROBE, ERR,
 264                  "Unable to allocate MSI interrupt Error: %d\n", err);
 265                 adapter->have_msi = FALSE;
 266                 /* proceed to try to request regular interrupt */
 267         }
 268         }
 269
 270 #endif
 271         if((err = request_irq(adapter->pdev->irq, &ixgb_intr,
 272                                   SA_SHIRQ | SA_SAMPLE_RANDOM,
 273                                   netdev->name, netdev))) {
 274                 DPRINTK(PROBE, ERR,
 275                  "Unable to allocate interrupt Error: %d\n", err);
 276                 return err;
 277         }
 278
 279         if((hw->max_frame_size != max_frame) ||
 280                 (hw->max_frame_size !=
 281                 (IXGB_READ_REG(hw, MFS) >> IXGB_MFS_SHIFT))) {
 282
 283                 hw->max_frame_size = max_frame;
 284
 285                 IXGB_WRITE_REG(hw, MFS, hw->max_frame_size << IXGB_MFS_SHIFT);
 286
 287                 if(hw->max_frame_size >
 288                    IXGB_MAX_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH) {
 289                         uint32_t ctrl0 = IXGB_READ_REG(hw, CTRL0);
 290
 291                         if(!(ctrl0 & IXGB_CTRL0_JFE)) {
 292                                 ctrl0 |= IXGB_CTRL0_JFE;
 293                                 IXGB_WRITE_REG(hw, CTRL0, ctrl0);
 294                         }
 295                 }
 296         }
 297
 298         mod_timer(&adapter->watchdog_timer, jiffies);
 299
 300 #ifdef CONFIG_IXGB_NAPI
 301         netif_poll_enable(netdev);
 302 #endif
 303         ixgb_irq_enable(adapter);
 304
 305         return 0;
 306 }
 307
 308 void
 309 ixgb_down(struct ixgb_adapter *adapter, boolean_t kill_watchdog)
 310 {
 311         struct net_device *netdev = adapter->netdev;
 312
 313         ixgb_irq_disable(adapter);
 314         free_irq(adapter->pdev->irq, netdev);
 315 #ifdef CONFIG_PCI_MSI
 316         if(adapter->have_msi == TRUE)
 317                 pci_disable_msi(adapter->pdev);
 318
 319 #endif
 320         if(kill_watchdog)
 321                 del_timer_sync(&adapter->watchdog_timer);
 322 #ifdef CONFIG_IXGB_NAPI
 323         netif_poll_disable(netdev);
 324 #endif
 325         adapter->link_speed = 0;
 326         adapter->link_duplex = 0;
 327         netif_carrier_off(netdev);
 328         netif_stop_queue(netdev);
 329
 330         ixgb_reset(adapter);
 331         ixgb_clean_tx_ring(adapter);
 332         ixgb_clean_rx_ring(adapter);
 333 }
 334
 335 void
 336 ixgb_reset(struct ixgb_adapter *adapter)
 337 {
 338
 339         ixgb_adapter_stop(&adapter->hw);
 340         if(!ixgb_init_hw(&adapter->hw))
 341                 DPRINTK(PROBE, ERR, "ixgb_init_hw failed.\n");
 342 }
 343
 344 /**
 345  * ixgb_probe - Device Initialization Routine
 346  * @pdev: PCI device information struct
 347  * @ent: entry in ixgb_pci_tbl
 348  *
 349  * Returns 0 on success, negative on failure
 350  *
 351  * ixgb_probe initializes an adapter identified by a pci_dev structure.
 352  * The OS initialization, configuring of the adapter private structure,
 353  * and a hardware reset occur.
 354  **/
 355
 356 static int __devinit
 357 ixgb_probe(struct pci_dev *pdev,
 358                 const struct pci_device_id *ent)
 359 {
 360         struct net_device *netdev = NULL;
 361         struct ixgb_adapter *adapter;
 362         static int cards_found = 0;
 363         unsigned long mmio_start;
 364         int mmio_len;
 365         int pci_using_dac;
 366         int i;
 367         int err;
 368
 369         if((err = pci_enable_device(pdev)))
 370                 return err;
 371
 372         if(!(err = pci_set_dma_mask(pdev, DMA_64BIT_MASK)) &&
 373            !(err = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK))) {
 374                 pci_using_dac = 1;
 375         } else {
 376                 if((err = pci_set_dma_mask(pdev, DMA_32BIT_MASK)) ||
 377                    (err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK))) {
 378                         printk(KERN_ERR
 379                          "ixgb: No usable DMA configuration, aborting\n");
 380                         goto err_dma_mask;
 381                 }
 382                 pci_using_dac = 0;
 383         }
 384
 385         if((err = pci_request_regions(pdev, ixgb_driver_name)))
 386                 goto err_request_regions;
 387
 388         pci_set_master(pdev);
 389
 390         netdev = alloc_etherdev(sizeof(struct ixgb_adapter));
 391         if(!netdev) {
 392                 err = -ENOMEM;
 393                 goto err_alloc_etherdev;
 394         }
 395
 396         SET_MODULE_OWNER(netdev);
 397         SET_NETDEV_DEV(netdev, &pdev->dev);
 398
 399         pci_set_drvdata(pdev, netdev);
 400         adapter = netdev_priv(netdev);
 401         adapter->netdev = netdev;
 402         adapter->pdev = pdev;
 403         adapter->hw.back = adapter;
 404         adapter->msg_enable = netif_msg_init(debug, DEFAULT_DEBUG_LEVEL_SHIFT);
 405
 406         mmio_start = pci_resource_start(pdev, BAR_0);
 407         mmio_len = pci_resource_len(pdev, BAR_0);
 408
 409         adapter->hw.hw_addr = ioremap(mmio_start, mmio_len);
 410         if(!adapter->hw.hw_addr) {
 411                 err = -EIO;
 412                 goto err_ioremap;
 413         }
 414
 415         for(i = BAR_1; i <= BAR_5; i++) {
 416                 if(pci_resource_len(pdev, i) == 0)
 417                         continue;
 418                 if(pci_resource_flags(pdev, i) & IORESOURCE_IO) {
 419                         adapter->hw.io_base = pci_resource_start(pdev, i);
 420                         break;
 421                 }
 422         }
 423
 424         netdev->open = &ixgb_open;
 425         netdev->stop = &ixgb_close;
 426         netdev->hard_start_xmit = &ixgb_xmit_frame;
 427         netdev->get_stats = &ixgb_get_stats;
 428         netdev->set_multicast_list = &ixgb_set_multi;
 429         netdev->set_mac_address = &ixgb_set_mac;
 430         netdev->change_mtu = &ixgb_change_mtu;
 431         ixgb_set_ethtool_ops(netdev);
 432         netdev->tx_timeout = &ixgb_tx_timeout;
 433         netdev->watchdog_timeo = 5 * HZ;
 434 #ifdef CONFIG_IXGB_NAPI
 435         netdev->poll = &ixgb_clean;
 436         netdev->weight = 64;
 437 #endif
 438         netdev->vlan_rx_register = ixgb_vlan_rx_register;
 439         netdev->vlan_rx_add_vid = ixgb_vlan_rx_add_vid;
 440         netdev->vlan_rx_kill_vid = ixgb_vlan_rx_kill_vid;
 441 #ifdef CONFIG_NET_POLL_CONTROLLER
 442         netdev->poll_controller = ixgb_netpoll;
 443 #endif
 444
 445         strcpy(netdev->name, pci_name(pdev));
 446         netdev->mem_start = mmio_start;
 447         netdev->mem_end = mmio_start + mmio_len;
 448         netdev->base_addr = adapter->hw.io_base;
 449
 450         adapter->bd_number = cards_found;
 451         adapter->link_speed = 0;
 452         adapter->link_duplex = 0;
 453
 454         /* setup the private structure */
 455
 456         if((err = ixgb_sw_init(adapter)))
 457                 goto err_sw_init;
 458
 459         netdev->features = NETIF_F_SG |
 460                            NETIF_F_HW_CSUM |
 461                            NETIF_F_HW_VLAN_TX |
 462                            NETIF_F_HW_VLAN_RX |
 463                            NETIF_F_HW_VLAN_FILTER;
 464 #ifdef NETIF_F_TSO
 465         netdev->features |= NETIF_F_TSO;
 466 #endif
 467 #ifdef NETIF_F_LLTX
 468         netdev->features |= NETIF_F_LLTX;
 469 #endif
 470
 471         if(pci_using_dac)
 472                 netdev->features |= NETIF_F_HIGHDMA;
 473
 474         /* make sure the EEPROM is good */
 475
 476         if(!ixgb_validate_eeprom_checksum(&adapter->hw)) {
 477                 DPRINTK(PROBE, ERR, "The EEPROM Checksum Is Not Valid\n");
 478                 err = -EIO;
 479                 goto err_eeprom;
 480         }
 481
 482         ixgb_get_ee_mac_addr(&adapter->hw, netdev->dev_addr);
 483         memcpy(netdev->perm_addr, netdev->dev_addr, netdev->addr_len);
 484
 485         if(!is_valid_ether_addr(netdev->perm_addr)) {
 486                 DPRINTK(PROBE, ERR, "Invalid MAC Address\n");
 487                 err = -EIO;
 488                 goto err_eeprom;
 489         }
 490
 491         adapter->part_num = ixgb_get_ee_pba_number(&adapter->hw);
 492
 493         init_timer(&adapter->watchdog_timer);
 494         adapter->watchdog_timer.function = &ixgb_watchdog;
 495         adapter->watchdog_timer.data = (unsigned long)adapter;
 496
 497         INIT_WORK(&adapter->tx_timeout_task,
 498                   (void (*)(void *))ixgb_tx_timeout_task, netdev);
 499
 500         strcpy(netdev->name, "eth%d");
 501         if((err = register_netdev(netdev)))
 502                 goto err_register;
 503
 504         /* we're going to reset, so assume we have no link for now */
 505
 506         netif_carrier_off(netdev);
 507         netif_stop_queue(netdev);
 508
 509         DPRINTK(PROBE, INFO, "Intel(R) PRO/10GbE Network Connection\n");
 510         ixgb_check_options(adapter);
 511         /* reset the hardware with the new settings */
 512
 513         ixgb_reset(adapter);
 514
 515         cards_found++;
 516         return 0;
 517
 518 err_register:
 519 err_sw_init:
 520 err_eeprom:
 521         iounmap(adapter->hw.hw_addr);
 522 err_ioremap:
 523         free_netdev(netdev);
 524 err_alloc_etherdev:
 525         pci_release_regions(pdev);
 526 err_request_regions:
 527 err_dma_mask:
 528         pci_disable_device(pdev);
 529         return err;
 530 }
 531
 532 /**
 533  * ixgb_remove - Device Removal Routine
 534  * @pdev: PCI device information struct
 535  *
 536  * ixgb_remove is called by the PCI subsystem to alert the driver
 537  * that it should release a PCI device.  The could be caused by a
 538  * Hot-Plug event, or because the driver is going to be removed from
 539  * memory.
 540  **/
 541
 542 static void __devexit
 543 ixgb_remove(struct pci_dev *pdev)
 544 {
 545         struct net_device *netdev = pci_get_drvdata(pdev);
 546         struct ixgb_adapter *adapter = netdev_priv(netdev);
 547
 548         unregister_netdev(netdev);
 549
 550         iounmap(adapter->hw.hw_addr);
 551         pci_release_regions(pdev);
 552
 553         free_netdev(netdev);
 554 }
 555
 556 /**
 557  * ixgb_sw_init - Initialize general software structures (struct ixgb_adapter)
 558  * @adapter: board private structure to initialize
 559  *
 560  * ixgb_sw_init initializes the Adapter private data structure.
 561  * Fields are initialized based on PCI device information and
 562  * OS network device settings (MTU size).
 563  **/
 564
 565 static int __devinit
 566 ixgb_sw_init(struct ixgb_adapter *adapter)
 567 {
 568         struct ixgb_hw *hw = &adapter->hw;
 569         struct net_device *netdev = adapter->netdev;
 570         struct pci_dev *pdev = adapter->pdev;
 571
 572         /* PCI config space info */
 573
 574         hw->vendor_id = pdev->vendor;
 575         hw->device_id = pdev->device;
 576         hw->subsystem_vendor_id = pdev->subsystem_vendor;
 577         hw->subsystem_id = pdev->subsystem_device;
 578
 579         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
 580         adapter->rx_buffer_len = hw->max_frame_size;
 581
 582         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
 583            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
 584            || (hw->device_id == IXGB_DEVICE_ID_82597EX_LR)
 585            || (hw->device_id == IXGB_DEVICE_ID_82597EX_SR))
 586                         hw->mac_type = ixgb_82597;
 587         else {
 588                 /* should never have loaded on this device */
 589                 DPRINTK(PROBE, ERR, "unsupported device id\n");
 590         }
 591
 592         /* enable flow control to be programmed */
 593         hw->fc.send_xon = 1;
 594
 595         atomic_set(&adapter->irq_sem, 1);
 596         spin_lock_init(&adapter->tx_lock);
 597
 598         return 0;
 599 }
 600
 601 /**
 602  * ixgb_open - Called when a network interface is made active
 603  * @netdev: network interface device structure
 604  *
 605  * Returns 0 on success, negative value on failure
 606  *
 607  * The open entry point is called when a network interface is made
 608  * active by the system (IFF_UP).  At this point all resources needed
 609  * for transmit and receive operations are allocated, the interrupt
 610  * handler is registered with the OS, the watchdog timer is started,
 611  * and the stack is notified that the interface is ready.
 612  **/
 613
 614 static int
 615 ixgb_open(struct net_device *netdev)
 616 {
 617         struct ixgb_adapter *adapter = netdev_priv(netdev);
 618         int err;
 619
 620         /* allocate transmit descriptors */
 621
 622         if((err = ixgb_setup_tx_resources(adapter)))
 623                 goto err_setup_tx;
 624
 625         /* allocate receive descriptors */
 626
 627         if((err = ixgb_setup_rx_resources(adapter)))
 628                 goto err_setup_rx;
 629
 630         if((err = ixgb_up(adapter)))
 631                 goto err_up;
 632
 633         return 0;
 634
 635 err_up:
 636         ixgb_free_rx_resources(adapter);
 637 err_setup_rx:
 638         ixgb_free_tx_resources(adapter);
 639 err_setup_tx:
 640         ixgb_reset(adapter);
 641
 642         return err;
 643 }
 644
 645 /**
 646  * ixgb_close - Disables a network interface
 647  * @netdev: network interface device structure
 648  *
 649  * Returns 0, this is not allowed to fail
 650  *
 651  * The close entry point is called when an interface is de-activated
 652  * by the OS.  The hardware is still under the drivers control, but
 653  * needs to be disabled.  A global MAC reset is issued to stop the
 654  * hardware, and all transmit and receive resources are freed.
 655  **/
 656
 657 static int
 658 ixgb_close(struct net_device *netdev)
 659 {
 660         struct ixgb_adapter *adapter = netdev_priv(netdev);
 661
 662         ixgb_down(adapter, TRUE);
 663
 664         ixgb_free_tx_resources(adapter);
 665         ixgb_free_rx_resources(adapter);
 666
 667         return 0;
 668 }
 669
 670 /**
 671  * ixgb_setup_tx_resources - allocate Tx resources (Descriptors)
 672  * @adapter: board private structure
 673  *
 674  * Return 0 on success, negative on failure
 675  **/
 676
 677 int
 678 ixgb_setup_tx_resources(struct ixgb_adapter *adapter)
 679 {
 680         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
 681         struct pci_dev *pdev = adapter->pdev;
 682         int size;
 683
 684         size = sizeof(struct ixgb_buffer) * txdr->count;
 685         txdr->buffer_info = vmalloc(size);
 686         if(!txdr->buffer_info) {
 687                 DPRINTK(PROBE, ERR,
 688                  "Unable to allocate transmit descriptor ring memory\n");
 689                 return -ENOMEM;
 690         }
 691         memset(txdr->buffer_info, 0, size);
 692
 693         /* round up to nearest 4K */
 694
 695         txdr->size = txdr->count * sizeof(struct ixgb_tx_desc);
 696         IXGB_ROUNDUP(txdr->size, 4096);
 697
 698         txdr->desc = pci_alloc_consistent(pdev, txdr->size, &txdr->dma);
 699         if(!txdr->desc) {
 700                 vfree(txdr->buffer_info);
 701                 DPRINTK(PROBE, ERR,
 702                  "Unable to allocate transmit descriptor memory\n");
 703                 return -ENOMEM;
 704         }
 705         memset(txdr->desc, 0, txdr->size);
 706
 707         txdr->next_to_use = 0;
 708         txdr->next_to_clean = 0;
 709
 710         return 0;
 711 }
 712
 713 /**
 714  * ixgb_configure_tx - Configure 82597 Transmit Unit after Reset.
 715  * @adapter: board private structure
 716  *
 717  * Configure the Tx unit of the MAC after a reset.
 718  **/
 719
 720 static void
 721 ixgb_configure_tx(struct ixgb_adapter *adapter)
 722 {
 723         uint64_t tdba = adapter->tx_ring.dma;
 724         uint32_t tdlen = adapter->tx_ring.count * sizeof(struct ixgb_tx_desc);
 725         uint32_t tctl;
 726         struct ixgb_hw *hw = &adapter->hw;
 727
 728         /* Setup the Base and Length of the Tx Descriptor Ring
 729          * tx_ring.dma can be either a 32 or 64 bit value
 730          */
 731
 732         IXGB_WRITE_REG(hw, TDBAL, (tdba & 0x00000000ffffffffULL));
 733         IXGB_WRITE_REG(hw, TDBAH, (tdba >> 32));
 734
 735         IXGB_WRITE_REG(hw, TDLEN, tdlen);
 736
 737         /* Setup the HW Tx Head and Tail descriptor pointers */
 738
 739         IXGB_WRITE_REG(hw, TDH, 0);
 740         IXGB_WRITE_REG(hw, TDT, 0);
 741
 742         /* don't set up txdctl, it induces performance problems if configured
 743          * incorrectly */
 744         /* Set the Tx Interrupt Delay register */
 745
 746         IXGB_WRITE_REG(hw, TIDV, adapter->tx_int_delay);
 747
 748         /* Program the Transmit Control Register */
 749
 750         tctl = IXGB_TCTL_TCE | IXGB_TCTL_TXEN | IXGB_TCTL_TPDE;
 751         IXGB_WRITE_REG(hw, TCTL, tctl);
 752
 753         /* Setup Transmit Descriptor Settings for this adapter */
 754         adapter->tx_cmd_type =
 755                 IXGB_TX_DESC_TYPE
 756                 | (adapter->tx_int_delay_enable ? IXGB_TX_DESC_CMD_IDE : 0);
 757 }
 758
 759 /**
 760  * ixgb_setup_rx_resources - allocate Rx resources (Descriptors)
 761  * @adapter: board private structure
 762  *
 763  * Returns 0 on success, negative on failure
 764  **/
 765
 766 int
 767 ixgb_setup_rx_resources(struct ixgb_adapter *adapter)
 768 {
 769         struct ixgb_desc_ring *rxdr = &adapter->rx_ring;
 770         struct pci_dev *pdev = adapter->pdev;
 771         int size;
 772
 773         size = sizeof(struct ixgb_buffer) * rxdr->count;
 774         rxdr->buffer_info = vmalloc(size);
 775         if(!rxdr->buffer_info) {
 776                 DPRINTK(PROBE, ERR,
 777                  "Unable to allocate receive descriptor ring\n");
 778                 return -ENOMEM;
 779         }
 780         memset(rxdr->buffer_info, 0, size);
 781
 782         /* Round up to nearest 4K */
 783
 784         rxdr->size = rxdr->count * sizeof(struct ixgb_rx_desc);
 785         IXGB_ROUNDUP(rxdr->size, 4096);
 786
 787         rxdr->desc = pci_alloc_consistent(pdev, rxdr->size, &rxdr->dma);
 788
 789         if(!rxdr->desc) {
 790                 vfree(rxdr->buffer_info);
 791                 DPRINTK(PROBE, ERR,
 792                  "Unable to allocate receive descriptors\n");
 793                 return -ENOMEM;
 794         }
 795         memset(rxdr->desc, 0, rxdr->size);
 796
 797         rxdr->next_to_clean = 0;
 798         rxdr->next_to_use = 0;
 799
 800         return 0;
 801 }
 802
 803 /**
 804  * ixgb_setup_rctl - configure the receive control register
 805  * @adapter: Board private structure
 806  **/
 807
 808 static void
 809 ixgb_setup_rctl(struct ixgb_adapter *adapter)
 810 {
 811         uint32_t rctl;
 812
 813         rctl = IXGB_READ_REG(&adapter->hw, RCTL);
 814
 815         rctl &= ~(3 << IXGB_RCTL_MO_SHIFT);
 816
 817         rctl |=
 818                 IXGB_RCTL_BAM | IXGB_RCTL_RDMTS_1_2 |
 819                 IXGB_RCTL_RXEN | IXGB_RCTL_CFF |
 820                 (adapter->hw.mc_filter_type << IXGB_RCTL_MO_SHIFT);
 821
 822         rctl |= IXGB_RCTL_SECRC;
 823
 824         if (adapter->rx_buffer_len <= IXGB_RXBUFFER_2048)
 825                 rctl |= IXGB_RCTL_BSIZE_2048;
 826         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_4096)
 827                 rctl |= IXGB_RCTL_BSIZE_4096;
 828         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_8192)
 829                 rctl |= IXGB_RCTL_BSIZE_8192;
 830         else if (adapter->rx_buffer_len <= IXGB_RXBUFFER_16384)
 831                 rctl |= IXGB_RCTL_BSIZE_16384;
 832
 833         IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
 834 }
 835
 836 /**
 837  * ixgb_configure_rx - Configure 82597 Receive Unit after Reset.
 838  * @adapter: board private structure
 839  *
 840  * Configure the Rx unit of the MAC after a reset.
 841  **/
 842
 843 static void
 844 ixgb_configure_rx(struct ixgb_adapter *adapter)
 845 {
 846         uint64_t rdba = adapter->rx_ring.dma;
 847         uint32_t rdlen = adapter->rx_ring.count * sizeof(struct ixgb_rx_desc);
 848         struct ixgb_hw *hw = &adapter->hw;
 849         uint32_t rctl;
 850         uint32_t rxcsum;
 851         uint32_t rxdctl;
 852
 853         /* make sure receives are disabled while setting up the descriptors */
 854
 855         rctl = IXGB_READ_REG(hw, RCTL);
 856         IXGB_WRITE_REG(hw, RCTL, rctl & ~IXGB_RCTL_RXEN);
 857
 858         /* set the Receive Delay Timer Register */
 859
 860         IXGB_WRITE_REG(hw, RDTR, adapter->rx_int_delay);
 861
 862         /* Setup the Base and Length of the Rx Descriptor Ring */
 863
 864         IXGB_WRITE_REG(hw, RDBAL, (rdba & 0x00000000ffffffffULL));
 865         IXGB_WRITE_REG(hw, RDBAH, (rdba >> 32));
 866
 867         IXGB_WRITE_REG(hw, RDLEN, rdlen);
 868
 869         /* Setup the HW Rx Head and Tail Descriptor Pointers */
 870         IXGB_WRITE_REG(hw, RDH, 0);
 871         IXGB_WRITE_REG(hw, RDT, 0);
 872
 873         /* set up pre-fetching of receive buffers so we get some before we
 874          * run out (default hardware behavior is to run out before fetching
 875          * more).  This sets up to fetch if HTHRESH rx descriptors are avail
 876          * and the descriptors in hw cache are below PTHRESH.  This avoids
 877          * the hardware behavior of fetching <=512 descriptors in a single
 878          * burst that pre-empts all other activity, usually causing fifo
 879          * overflows. */
 880         /* use WTHRESH to burst write 16 descriptors or burst when RXT0 */
 881         rxdctl = RXDCTL_WTHRESH_DEFAULT << IXGB_RXDCTL_WTHRESH_SHIFT |
 882                  RXDCTL_HTHRESH_DEFAULT << IXGB_RXDCTL_HTHRESH_SHIFT |
 883                  RXDCTL_PTHRESH_DEFAULT << IXGB_RXDCTL_PTHRESH_SHIFT;
 884         IXGB_WRITE_REG(hw, RXDCTL, rxdctl);
 885
 886         /* Enable Receive Checksum Offload for TCP and UDP */
 887         if(adapter->rx_csum == TRUE) {
 888                 rxcsum = IXGB_READ_REG(hw, RXCSUM);
 889                 rxcsum |= IXGB_RXCSUM_TUOFL;
 890                 IXGB_WRITE_REG(hw, RXCSUM, rxcsum);
 891         }
 892
 893         /* Enable Receives */
 894
 895         IXGB_WRITE_REG(hw, RCTL, rctl);
 896 }
 897
 898 /**
 899  * ixgb_free_tx_resources - Free Tx Resources
 900  * @adapter: board private structure
 901  *
 902  * Free all transmit software resources
 903  **/
 904
 905 void
 906 ixgb_free_tx_resources(struct ixgb_adapter *adapter)
 907 {
 908         struct pci_dev *pdev = adapter->pdev;
 909
 910         ixgb_clean_tx_ring(adapter);
 911
 912         vfree(adapter->tx_ring.buffer_info);
 913         adapter->tx_ring.buffer_info = NULL;
 914
 915         pci_free_consistent(pdev, adapter->tx_ring.size,
 916                             adapter->tx_ring.desc, adapter->tx_ring.dma);
 917
 918         adapter->tx_ring.desc = NULL;
 919 }
 920
 921 static void
 922 ixgb_unmap_and_free_tx_resource(struct ixgb_adapter *adapter,
 923                                         struct ixgb_buffer *buffer_info)
 924 {
 925         struct pci_dev *pdev = adapter->pdev;
 926
 927         if (buffer_info->dma)
 928                 pci_unmap_page(pdev, buffer_info->dma, buffer_info->length,
 929                                PCI_DMA_TODEVICE);
 930
 931         if (buffer_info->skb)
 932                 dev_kfree_skb_any(buffer_info->skb);
 933
 934         buffer_info->skb = NULL;
 935         buffer_info->dma = 0;
 936         buffer_info->time_stamp = 0;
 937         /* these fields must always be initialized in tx
 938          * buffer_info->length = 0;
 939          * buffer_info->next_to_watch = 0; */
 940 }
 941
 942 /**
 943  * ixgb_clean_tx_ring - Free Tx Buffers
 944  * @adapter: board private structure
 945  **/
 946
 947 static void
 948 ixgb_clean_tx_ring(struct ixgb_adapter *adapter)
 949 {
 950         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
 951         struct ixgb_buffer *buffer_info;
 952         unsigned long size;
 953         unsigned int i;
 954
 955         /* Free all the Tx ring sk_buffs */
 956
 957         for(i = 0; i < tx_ring->count; i++) {
 958                 buffer_info = &tx_ring->buffer_info[i];
 959                 ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
 960         }
 961
 962         size = sizeof(struct ixgb_buffer) * tx_ring->count;
 963         memset(tx_ring->buffer_info, 0, size);
 964
 965         /* Zero out the descriptor ring */
 966
 967         memset(tx_ring->desc, 0, tx_ring->size);
 968
 969         tx_ring->next_to_use = 0;
 970         tx_ring->next_to_clean = 0;
 971
 972         IXGB_WRITE_REG(&adapter->hw, TDH, 0);
 973         IXGB_WRITE_REG(&adapter->hw, TDT, 0);
 974 }
 975
 976 /**
 977  * ixgb_free_rx_resources - Free Rx Resources
 978  * @adapter: board private structure
 979  *
 980  * Free all receive software resources
 981  **/
 982
 983 void
 984 ixgb_free_rx_resources(struct ixgb_adapter *adapter)
 985 {
 986         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
 987         struct pci_dev *pdev = adapter->pdev;
 988
 989         ixgb_clean_rx_ring(adapter);
 990
 991         vfree(rx_ring->buffer_info);
 992         rx_ring->buffer_info = NULL;
 993
 994         pci_free_consistent(pdev, rx_ring->size, rx_ring->desc, rx_ring->dma);
 995
 996         rx_ring->desc = NULL;
 997 }
 998
 999 /**
1000  * ixgb_clean_rx_ring - Free Rx Buffers
1001  * @adapter: board private structure
1002  **/
1003
1004 static void
1005 ixgb_clean_rx_ring(struct ixgb_adapter *adapter)
1006 {
1007         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1008         struct ixgb_buffer *buffer_info;
1009         struct pci_dev *pdev = adapter->pdev;
1010         unsigned long size;
1011         unsigned int i;
1012
1013         /* Free all the Rx ring sk_buffs */
1014
1015         for(i = 0; i < rx_ring->count; i++) {
1016                 buffer_info = &rx_ring->buffer_info[i];
1017                 if(buffer_info->skb) {
1018
1019                         pci_unmap_single(pdev,
1020                                          buffer_info->dma,
1021                                          buffer_info->length,
1022                                          PCI_DMA_FROMDEVICE);
1023
1024                         dev_kfree_skb(buffer_info->skb);
1025
1026                         buffer_info->skb = NULL;
1027                 }
1028         }
1029
1030         size = sizeof(struct ixgb_buffer) * rx_ring->count;
1031         memset(rx_ring->buffer_info, 0, size);
1032
1033         /* Zero out the descriptor ring */
1034
1035         memset(rx_ring->desc, 0, rx_ring->size);
1036
1037         rx_ring->next_to_clean = 0;
1038         rx_ring->next_to_use = 0;
1039
1040         IXGB_WRITE_REG(&adapter->hw, RDH, 0);
1041         IXGB_WRITE_REG(&adapter->hw, RDT, 0);
1042 }
1043
1044 /**
1045  * ixgb_set_mac - Change the Ethernet Address of the NIC
1046  * @netdev: network interface device structure
1047  * @p: pointer to an address structure
1048  *
1049  * Returns 0 on success, negative on failure
1050  **/
1051
1052 static int
1053 ixgb_set_mac(struct net_device *netdev, void *p)
1054 {
1055         struct ixgb_adapter *adapter = netdev_priv(netdev);
1056         struct sockaddr *addr = p;
1057
1058         if(!is_valid_ether_addr(addr->sa_data))
1059                 return -EADDRNOTAVAIL;
1060
1061         memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
1062
1063         ixgb_rar_set(&adapter->hw, addr->sa_data, 0);
1064
1065         return 0;
1066 }
1067
1068 /**
1069  * ixgb_set_multi - Multicast and Promiscuous mode set
1070  * @netdev: network interface device structure
1071  *
1072  * The set_multi entry point is called whenever the multicast address
1073  * list or the network interface flags are updated.  This routine is
1074  * responsible for configuring the hardware for proper multicast,
1075  * promiscuous mode, and all-multi behavior.
1076  **/
1077
1078 static void
1079 ixgb_set_multi(struct net_device *netdev)
1080 {
1081         struct ixgb_adapter *adapter = netdev_priv(netdev);
1082         struct ixgb_hw *hw = &adapter->hw;
1083         struct dev_mc_list *mc_ptr;
1084         uint32_t rctl;
1085         int i;
1086
1087         /* Check for Promiscuous and All Multicast modes */
1088
1089         rctl = IXGB_READ_REG(hw, RCTL);
1090
1091         if(netdev->flags & IFF_PROMISC) {
1092                 rctl |= (IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1093         } else if(netdev->flags & IFF_ALLMULTI) {
1094                 rctl |= IXGB_RCTL_MPE;
1095                 rctl &= ~IXGB_RCTL_UPE;
1096         } else {
1097                 rctl &= ~(IXGB_RCTL_UPE | IXGB_RCTL_MPE);
1098         }
1099
1100         if(netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES) {
1101                 rctl |= IXGB_RCTL_MPE;
1102                 IXGB_WRITE_REG(hw, RCTL, rctl);
1103         } else {
1104                 uint8_t mta[netdev->mc_count * IXGB_ETH_LENGTH_OF_ADDRESS];
1105
1106                 IXGB_WRITE_REG(hw, RCTL, rctl);
1107
1108                 for(i = 0, mc_ptr = netdev->mc_list; mc_ptr;
1109                         i++, mc_ptr = mc_ptr->next)
1110                         memcpy(&mta[i * IXGB_ETH_LENGTH_OF_ADDRESS],
1111                                    mc_ptr->dmi_addr, IXGB_ETH_LENGTH_OF_ADDRESS);
1112
1113                 ixgb_mc_addr_list_update(hw, mta, netdev->mc_count, 0);
1114         }
1115 }
1116
1117 /**
1118  * ixgb_watchdog - Timer Call-back
1119  * @data: pointer to netdev cast into an unsigned long
1120  **/
1121
1122 static void
1123 ixgb_watchdog(unsigned long data)
1124 {
1125         struct ixgb_adapter *adapter = (struct ixgb_adapter *)data;
1126         struct net_device *netdev = adapter->netdev;
1127         struct ixgb_desc_ring *txdr = &adapter->tx_ring;
1128
1129         ixgb_check_for_link(&adapter->hw);
1130
1131         if (ixgb_check_for_bad_link(&adapter->hw)) {
1132                 /* force the reset path */
1133                 netif_stop_queue(netdev);
1134         }
1135
1136         if(adapter->hw.link_up) {
1137                 if(!netif_carrier_ok(netdev)) {
1138                         DPRINTK(LINK, INFO,
1139                                 "NIC Link is Up 10000 Mbps Full Duplex\n");
1140                         adapter->link_speed = 10000;
1141                         adapter->link_duplex = FULL_DUPLEX;
1142                         netif_carrier_on(netdev);
1143                         netif_wake_queue(netdev);
1144                 }
1145         } else {
1146                 if(netif_carrier_ok(netdev)) {
1147                         adapter->link_speed = 0;
1148                         adapter->link_duplex = 0;
1149                         DPRINTK(LINK, INFO, "NIC Link is Down\n");
1150                         netif_carrier_off(netdev);
1151                         netif_stop_queue(netdev);
1152
1153                 }
1154         }
1155
1156         ixgb_update_stats(adapter);
1157
1158         if(!netif_carrier_ok(netdev)) {
1159                 if(IXGB_DESC_UNUSED(txdr) + 1 < txdr->count) {
1160                         /* We've lost link, so the controller stops DMA,
1161                          * but we've got queued Tx work that's never going
1162                          * to get done, so reset controller to flush Tx.
1163                          * (Do the reset outside of interrupt context). */
1164                         schedule_work(&adapter->tx_timeout_task);
1165                 }
1166         }
1167
1168         /* Force detection of hung controller every watchdog period */
1169         adapter->detect_tx_hung = TRUE;
1170
1171         /* generate an interrupt to force clean up of any stragglers */
1172         IXGB_WRITE_REG(&adapter->hw, ICS, IXGB_INT_TXDW);
1173
1174         /* Reset the timer */
1175         mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);
1176 }
1177
1178 #define IXGB_TX_FLAGS_CSUM              0x00000001
1179 #define IXGB_TX_FLAGS_VLAN              0x00000002
1180 #define IXGB_TX_FLAGS_TSO               0x00000004
1181
1182 static int
1183 ixgb_tso(struct ixgb_adapter *adapter, struct sk_buff *skb)
1184 {
1185 #ifdef NETIF_F_TSO
1186         struct ixgb_context_desc *context_desc;
1187         unsigned int i;
1188         uint8_t ipcss, ipcso, tucss, tucso, hdr_len;
1189         uint16_t ipcse, tucse, mss;
1190         int err;
1191
1192         if(likely(skb_shinfo(skb)->tso_size)) {
1193                 if (skb_header_cloned(skb)) {
1194                         err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1195                         if (err)
1196                                 return err;
1197                 }
1198
1199                 hdr_len = ((skb->h.raw - skb->data) + (skb->h.th->doff << 2));
1200                 mss = skb_shinfo(skb)->tso_size;
1201                 skb->nh.iph->tot_len = 0;
1202                 skb->nh.iph->check = 0;
1203                 skb->h.th->check = ~csum_tcpudp_magic(skb->nh.iph->saddr,
1204                                                       skb->nh.iph->daddr,
1205                                                       0, IPPROTO_TCP, 0);
1206                 ipcss = skb->nh.raw - skb->data;
1207                 ipcso = (void *)&(skb->nh.iph->check) - (void *)skb->data;
1208                 ipcse = skb->h.raw - skb->data - 1;
1209                 tucss = skb->h.raw - skb->data;
1210                 tucso = (void *)&(skb->h.th->check) - (void *)skb->data;
1211                 tucse = 0;
1212
1213                 i = adapter->tx_ring.next_to_use;
1214                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1215
1216                 context_desc->ipcss = ipcss;
1217                 context_desc->ipcso = ipcso;
1218                 context_desc->ipcse = cpu_to_le16(ipcse);
1219                 context_desc->tucss = tucss;
1220                 context_desc->tucso = tucso;
1221                 context_desc->tucse = cpu_to_le16(tucse);
1222                 context_desc->mss = cpu_to_le16(mss);
1223                 context_desc->hdr_len = hdr_len;
1224                 context_desc->status = 0;
1225                 context_desc->cmd_type_len = cpu_to_le32(
1226                                                   IXGB_CONTEXT_DESC_TYPE
1227                                                 | IXGB_CONTEXT_DESC_CMD_TSE
1228                                                 | IXGB_CONTEXT_DESC_CMD_IP
1229                                                 | IXGB_CONTEXT_DESC_CMD_TCP
1230                                                 | IXGB_CONTEXT_DESC_CMD_IDE
1231                                                 | (skb->len - (hdr_len)));
1232
1233
1234                 if(++i == adapter->tx_ring.count) i = 0;
1235                 adapter->tx_ring.next_to_use = i;
1236
1237                 return 1;
1238         }
1239 #endif
1240
1241         return 0;
1242 }
1243
1244 static boolean_t
1245 ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
1246 {
1247         struct ixgb_context_desc *context_desc;
1248         unsigned int i;
1249         uint8_t css, cso;
1250
1251         if(likely(skb->ip_summed == CHECKSUM_HW)) {
1252                 css = skb->h.raw - skb->data;
1253                 cso = (skb->h.raw + skb->csum) - skb->data;
1254
1255                 i = adapter->tx_ring.next_to_use;
1256                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
1257
1258                 context_desc->tucss = css;
1259                 context_desc->tucso = cso;
1260                 context_desc->tucse = 0;
1261                 /* zero out any previously existing data in one instruction */
1262                 *(uint32_t *)&(context_desc->ipcss) = 0;
1263                 context_desc->status = 0;
1264                 context_desc->hdr_len = 0;
1265                 context_desc->mss = 0;
1266                 context_desc->cmd_type_len =
1267                         cpu_to_le32(IXGB_CONTEXT_DESC_TYPE
1268                                     | IXGB_TX_DESC_CMD_IDE);
1269
1270                 if(++i == adapter->tx_ring.count) i = 0;
1271                 adapter->tx_ring.next_to_use = i;
1272
1273                 return TRUE;
1274         }
1275
1276         return FALSE;
1277 }
1278
1279 #define IXGB_MAX_TXD_PWR        14
1280 #define IXGB_MAX_DATA_PER_TXD   (1<<IXGB_MAX_TXD_PWR)
1281
1282 static int
1283 ixgb_tx_map(struct ixgb_adapter *adapter, struct sk_buff *skb,
1284             unsigned int first)
1285 {
1286         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1287         struct ixgb_buffer *buffer_info;
1288         int len = skb->len;
1289         unsigned int offset = 0, size, count = 0, i;
1290
1291         unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
1292         unsigned int f;
1293
1294         len -= skb->data_len;
1295
1296         i = tx_ring->next_to_use;
1297
1298         while(len) {
1299                 buffer_info = &tx_ring->buffer_info[i];
1300                 size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1301                 buffer_info->length = size;
1302                 buffer_info->dma =
1303                         pci_map_single(adapter->pdev,
1304                                 skb->data + offset,
1305                                 size,
1306                                 PCI_DMA_TODEVICE);
1307                 buffer_info->time_stamp = jiffies;
1308                 buffer_info->next_to_watch = 0;
1309
1310                 len -= size;
1311                 offset += size;
1312                 count++;
1313                 if(++i == tx_ring->count) i = 0;
1314         }
1315
1316         for(f = 0; f < nr_frags; f++) {
1317                 struct skb_frag_struct *frag;
1318
1319                 frag = &skb_shinfo(skb)->frags[f];
1320                 len = frag->size;
1321                 offset = 0;
1322
1323                 while(len) {
1324                         buffer_info = &tx_ring->buffer_info[i];
1325                         size = min(len, IXGB_MAX_JUMBO_FRAME_SIZE);
1326                         buffer_info->length = size;
1327                         buffer_info->dma =
1328                                 pci_map_page(adapter->pdev,
1329                                         frag->page,
1330                                         frag->page_offset + offset,
1331                                         size,
1332                                         PCI_DMA_TODEVICE);
1333                         buffer_info->time_stamp = jiffies;
1334                         buffer_info->next_to_watch = 0;
1335
1336                         len -= size;
1337                         offset += size;
1338                         count++;
1339                         if(++i == tx_ring->count) i = 0;
1340                 }
1341         }
1342         i = (i == 0) ? tx_ring->count - 1 : i - 1;
1343         tx_ring->buffer_info[i].skb = skb;
1344         tx_ring->buffer_info[first].next_to_watch = i;
1345
1346         return count;
1347 }
1348
1349 static void
1350 ixgb_tx_queue(struct ixgb_adapter *adapter, int count, int vlan_id,int tx_flags)
1351 {
1352         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1353         struct ixgb_tx_desc *tx_desc = NULL;
1354         struct ixgb_buffer *buffer_info;
1355         uint32_t cmd_type_len = adapter->tx_cmd_type;
1356         uint8_t status = 0;
1357         uint8_t popts = 0;
1358         unsigned int i;
1359
1360         if(tx_flags & IXGB_TX_FLAGS_TSO) {
1361                 cmd_type_len |= IXGB_TX_DESC_CMD_TSE;
1362                 popts |= (IXGB_TX_DESC_POPTS_IXSM | IXGB_TX_DESC_POPTS_TXSM);
1363         }
1364
1365         if(tx_flags & IXGB_TX_FLAGS_CSUM)
1366                 popts |= IXGB_TX_DESC_POPTS_TXSM;
1367
1368         if(tx_flags & IXGB_TX_FLAGS_VLAN) {
1369                 cmd_type_len |= IXGB_TX_DESC_CMD_VLE;
1370         }
1371
1372         i = tx_ring->next_to_use;
1373
1374         while(count--) {
1375                 buffer_info = &tx_ring->buffer_info[i];
1376                 tx_desc = IXGB_TX_DESC(*tx_ring, i);
1377                 tx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
1378                 tx_desc->cmd_type_len =
1379                         cpu_to_le32(cmd_type_len | buffer_info->length);
1380                 tx_desc->status = status;
1381                 tx_desc->popts = popts;
1382                 tx_desc->vlan = cpu_to_le16(vlan_id);
1383
1384                 if(++i == tx_ring->count) i = 0;
1385         }
1386
1387         tx_desc->cmd_type_len |= cpu_to_le32(IXGB_TX_DESC_CMD_EOP
1388                                 | IXGB_TX_DESC_CMD_RS );
1389
1390         /* Force memory writes to complete before letting h/w
1391          * know there are new descriptors to fetch.  (Only
1392          * applicable for weak-ordered memory model archs,
1393          * such as IA-64). */
1394         wmb();
1395
1396         tx_ring->next_to_use = i;
1397         IXGB_WRITE_REG(&adapter->hw, TDT, i);
1398 }
1399
1400 /* Tx Descriptors needed, worst case */
1401 #define TXD_USE_COUNT(S) (((S) >> IXGB_MAX_TXD_PWR) + \
1402                          (((S) & (IXGB_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
1403 #define DESC_NEEDED TXD_USE_COUNT(IXGB_MAX_DATA_PER_TXD) + \
1404         MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1
1405
1406 static int
1407 ixgb_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
1408 {
1409         struct ixgb_adapter *adapter = netdev_priv(netdev);
1410         unsigned int first;
1411         unsigned int tx_flags = 0;
1412         unsigned long flags;
1413         int vlan_id = 0;
1414         int tso;
1415
1416         if(skb->len <= 0) {
1417                 dev_kfree_skb_any(skb);
1418                 return 0;
1419         }
1420
1421 #ifdef NETIF_F_LLTX
1422         local_irq_save(flags);
1423         if (!spin_trylock(&adapter->tx_lock)) {
1424                 /* Collision - tell upper layer to requeue */
1425                 local_irq_restore(flags);
1426                 return NETDEV_TX_LOCKED;
1427         }
1428 #else
1429         spin_lock_irqsave(&adapter->tx_lock, flags);
1430 #endif
1431
1432         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED)) {
1433                 netif_stop_queue(netdev);
1434                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1435                 return NETDEV_TX_BUSY;
1436         }
1437
1438 #ifndef NETIF_F_LLTX
1439         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1440 #endif
1441
1442         if(adapter->vlgrp && vlan_tx_tag_present(skb)) {
1443                 tx_flags |= IXGB_TX_FLAGS_VLAN;
1444                 vlan_id = vlan_tx_tag_get(skb);
1445         }
1446
1447         first = adapter->tx_ring.next_to_use;
1448
1449         tso = ixgb_tso(adapter, skb);
1450         if (tso < 0) {
1451                 dev_kfree_skb_any(skb);
1452 #ifdef NETIF_F_LLTX
1453                 spin_unlock_irqrestore(&adapter->tx_lock, flags);
1454 #endif
1455                 return NETDEV_TX_OK;
1456         }
1457
1458         if (likely(tso))
1459                 tx_flags |= IXGB_TX_FLAGS_TSO;
1460         else if(ixgb_tx_csum(adapter, skb))
1461                 tx_flags |= IXGB_TX_FLAGS_CSUM;
1462
1463         ixgb_tx_queue(adapter, ixgb_tx_map(adapter, skb, first), vlan_id,
1464                         tx_flags);
1465
1466         netdev->trans_start = jiffies;
1467
1468 #ifdef NETIF_F_LLTX
1469         /* Make sure there is space in the ring for the next send. */
1470         if(unlikely(IXGB_DESC_UNUSED(&adapter->tx_ring) < DESC_NEEDED))
1471                 netif_stop_queue(netdev);
1472
1473         spin_unlock_irqrestore(&adapter->tx_lock, flags);
1474
1475 #endif
1476         return NETDEV_TX_OK;
1477 }
1478
1479 /**
1480  * ixgb_tx_timeout - Respond to a Tx Hang
1481  * @netdev: network interface device structure
1482  **/
1483
1484 static void
1485 ixgb_tx_timeout(struct net_device *netdev)
1486 {
1487         struct ixgb_adapter *adapter = netdev_priv(netdev);
1488
1489         /* Do the reset outside of interrupt context */
1490         schedule_work(&adapter->tx_timeout_task);
1491 }
1492
1493 static void
1494 ixgb_tx_timeout_task(struct net_device *netdev)
1495 {
1496         struct ixgb_adapter *adapter = netdev_priv(netdev);
1497
1498         adapter->tx_timeout_count++;
1499         ixgb_down(adapter, TRUE);
1500         ixgb_up(adapter);
1501 }
1502
1503 /**
1504  * ixgb_get_stats - Get System Network Statistics
1505  * @netdev: network interface device structure
1506  *
1507  * Returns the address of the device statistics structure.
1508  * The statistics are actually updated from the timer callback.
1509  **/
1510
1511 static struct net_device_stats *
1512 ixgb_get_stats(struct net_device *netdev)
1513 {
1514         struct ixgb_adapter *adapter = netdev_priv(netdev);
1515
1516         return &adapter->net_stats;
1517 }
1518
1519 /**
1520  * ixgb_change_mtu - Change the Maximum Transfer Unit
1521  * @netdev: network interface device structure
1522  * @new_mtu: new value for maximum frame size
1523  *
1524  * Returns 0 on success, negative on failure
1525  **/
1526
1527 static int
1528 ixgb_change_mtu(struct net_device *netdev, int new_mtu)
1529 {
1530         struct ixgb_adapter *adapter = netdev_priv(netdev);
1531         int max_frame = new_mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1532         int old_max_frame = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
1533
1534
1535         if((max_frame < IXGB_MIN_ENET_FRAME_SIZE_WITHOUT_FCS + ENET_FCS_LENGTH)
1536            || (max_frame > IXGB_MAX_JUMBO_FRAME_SIZE + ENET_FCS_LENGTH)) {
1537                 DPRINTK(PROBE, ERR, "Invalid MTU setting %d\n", new_mtu);
1538                 return -EINVAL;
1539         }
1540
1541         adapter->rx_buffer_len = max_frame;
1542
1543         netdev->mtu = new_mtu;
1544
1545         if ((old_max_frame != max_frame) && netif_running(netdev)) {
1546                 ixgb_down(adapter, TRUE);
1547                 ixgb_up(adapter);
1548         }
1549
1550         return 0;
1551 }
1552
1553 /**
1554  * ixgb_update_stats - Update the board statistics counters.
1555  * @adapter: board private structure
1556  **/
1557
1558 void
1559 ixgb_update_stats(struct ixgb_adapter *adapter)
1560 {
1561         struct net_device *netdev = adapter->netdev;
1562
1563         if((netdev->flags & IFF_PROMISC) || (netdev->flags & IFF_ALLMULTI) ||
1564            (netdev->mc_count > IXGB_MAX_NUM_MULTICAST_ADDRESSES)) {
1565                 u64 multi = IXGB_READ_REG(&adapter->hw, MPRCL);
1566                 u32 bcast_l = IXGB_READ_REG(&adapter->hw, BPRCL);
1567                 u32 bcast_h = IXGB_READ_REG(&adapter->hw, BPRCH);
1568                 u64 bcast = ((u64)bcast_h << 32) | bcast_l;
1569
1570                 multi |= ((u64)IXGB_READ_REG(&adapter->hw, MPRCH) << 32);
1571                 /* fix up multicast stats by removing broadcasts */
1572                 if(multi >= bcast)
1573                         multi -= bcast;
1574
1575                 adapter->stats.mprcl += (multi & 0xFFFFFFFF);
1576                 adapter->stats.mprch += (multi >> 32);
1577                 adapter->stats.bprcl += bcast_l;
1578                 adapter->stats.bprch += bcast_h;
1579         } else {
1580                 adapter->stats.mprcl += IXGB_READ_REG(&adapter->hw, MPRCL);
1581                 adapter->stats.mprch += IXGB_READ_REG(&adapter->hw, MPRCH);
1582                 adapter->stats.bprcl += IXGB_READ_REG(&adapter->hw, BPRCL);
1583                 adapter->stats.bprch += IXGB_READ_REG(&adapter->hw, BPRCH);
1584         }
1585         adapter->stats.tprl += IXGB_READ_REG(&adapter->hw, TPRL);
1586         adapter->stats.tprh += IXGB_READ_REG(&adapter->hw, TPRH);
1587         adapter->stats.gprcl += IXGB_READ_REG(&adapter->hw, GPRCL);
1588         adapter->stats.gprch += IXGB_READ_REG(&adapter->hw, GPRCH);
1589         adapter->stats.uprcl += IXGB_READ_REG(&adapter->hw, UPRCL);
1590         adapter->stats.uprch += IXGB_READ_REG(&adapter->hw, UPRCH);
1591         adapter->stats.vprcl += IXGB_READ_REG(&adapter->hw, VPRCL);
1592         adapter->stats.vprch += IXGB_READ_REG(&adapter->hw, VPRCH);
1593         adapter->stats.jprcl += IXGB_READ_REG(&adapter->hw, JPRCL);
1594         adapter->stats.jprch += IXGB_READ_REG(&adapter->hw, JPRCH);
1595         adapter->stats.gorcl += IXGB_READ_REG(&adapter->hw, GORCL);
1596         adapter->stats.gorch += IXGB_READ_REG(&adapter->hw, GORCH);
1597         adapter->stats.torl += IXGB_READ_REG(&adapter->hw, TORL);
1598         adapter->stats.torh += IXGB_READ_REG(&adapter->hw, TORH);
1599         adapter->stats.rnbc += IXGB_READ_REG(&adapter->hw, RNBC);
1600         adapter->stats.ruc += IXGB_READ_REG(&adapter->hw, RUC);
1601         adapter->stats.roc += IXGB_READ_REG(&adapter->hw, ROC);
1602         adapter->stats.rlec += IXGB_READ_REG(&adapter->hw, RLEC);
1603         adapter->stats.crcerrs += IXGB_READ_REG(&adapter->hw, CRCERRS);
1604         adapter->stats.icbc += IXGB_READ_REG(&adapter->hw, ICBC);
1605         adapter->stats.ecbc += IXGB_READ_REG(&adapter->hw, ECBC);
1606         adapter->stats.mpc += IXGB_READ_REG(&adapter->hw, MPC);
1607         adapter->stats.tptl += IXGB_READ_REG(&adapter->hw, TPTL);
1608         adapter->stats.tpth += IXGB_READ_REG(&adapter->hw, TPTH);
1609         adapter->stats.gptcl += IXGB_READ_REG(&adapter->hw, GPTCL);
1610         adapter->stats.gptch += IXGB_READ_REG(&adapter->hw, GPTCH);
1611         adapter->stats.bptcl += IXGB_READ_REG(&adapter->hw, BPTCL);
1612         adapter->stats.bptch += IXGB_READ_REG(&adapter->hw, BPTCH);
1613         adapter->stats.mptcl += IXGB_READ_REG(&adapter->hw, MPTCL);
1614         adapter->stats.mptch += IXGB_READ_REG(&adapter->hw, MPTCH);
1615         adapter->stats.uptcl += IXGB_READ_REG(&adapter->hw, UPTCL);
1616         adapter->stats.uptch += IXGB_READ_REG(&adapter->hw, UPTCH);
1617         adapter->stats.vptcl += IXGB_READ_REG(&adapter->hw, VPTCL);
1618         adapter->stats.vptch += IXGB_READ_REG(&adapter->hw, VPTCH);
1619         adapter->stats.jptcl += IXGB_READ_REG(&adapter->hw, JPTCL);
1620         adapter->stats.jptch += IXGB_READ_REG(&adapter->hw, JPTCH);
1621         adapter->stats.gotcl += IXGB_READ_REG(&adapter->hw, GOTCL);
1622         adapter->stats.gotch += IXGB_READ_REG(&adapter->hw, GOTCH);
1623         adapter->stats.totl += IXGB_READ_REG(&adapter->hw, TOTL);
1624         adapter->stats.toth += IXGB_READ_REG(&adapter->hw, TOTH);
1625         adapter->stats.dc += IXGB_READ_REG(&adapter->hw, DC);
1626         adapter->stats.plt64c += IXGB_READ_REG(&adapter->hw, PLT64C);
1627         adapter->stats.tsctc += IXGB_READ_REG(&adapter->hw, TSCTC);
1628         adapter->stats.tsctfc += IXGB_READ_REG(&adapter->hw, TSCTFC);
1629         adapter->stats.ibic += IXGB_READ_REG(&adapter->hw, IBIC);
1630         adapter->stats.rfc += IXGB_READ_REG(&adapter->hw, RFC);
1631         adapter->stats.lfc += IXGB_READ_REG(&adapter->hw, LFC);
1632         adapter->stats.pfrc += IXGB_READ_REG(&adapter->hw, PFRC);
1633         adapter->stats.pftc += IXGB_READ_REG(&adapter->hw, PFTC);
1634         adapter->stats.mcfrc += IXGB_READ_REG(&adapter->hw, MCFRC);
1635         adapter->stats.mcftc += IXGB_READ_REG(&adapter->hw, MCFTC);
1636         adapter->stats.xonrxc += IXGB_READ_REG(&adapter->hw, XONRXC);
1637         adapter->stats.xontxc += IXGB_READ_REG(&adapter->hw, XONTXC);
1638         adapter->stats.xoffrxc += IXGB_READ_REG(&adapter->hw, XOFFRXC);
1639         adapter->stats.xofftxc += IXGB_READ_REG(&adapter->hw, XOFFTXC);
1640         adapter->stats.rjc += IXGB_READ_REG(&adapter->hw, RJC);
1641
1642         /* Fill out the OS statistics structure */
1643
1644         adapter->net_stats.rx_packets = adapter->stats.gprcl;
1645         adapter->net_stats.tx_packets = adapter->stats.gptcl;
1646         adapter->net_stats.rx_bytes = adapter->stats.gorcl;
1647         adapter->net_stats.tx_bytes = adapter->stats.gotcl;
1648         adapter->net_stats.multicast = adapter->stats.mprcl;
1649         adapter->net_stats.collisions = 0;
1650
1651         /* ignore RLEC as it reports errors for padded (<64bytes) frames
1652          * with a length in the type/len field */
1653         adapter->net_stats.rx_errors =
1654             /* adapter->stats.rnbc + */ adapter->stats.crcerrs +
1655             adapter->stats.ruc +
1656             adapter->stats.roc /*+ adapter->stats.rlec */  +
1657             adapter->stats.icbc +
1658             adapter->stats.ecbc + adapter->stats.mpc;
1659
1660         /* see above
1661          * adapter->net_stats.rx_length_errors = adapter->stats.rlec;
1662          */
1663
1664         adapter->net_stats.rx_crc_errors = adapter->stats.crcerrs;
1665         adapter->net_stats.rx_fifo_errors = adapter->stats.mpc;
1666         adapter->net_stats.rx_missed_errors = adapter->stats.mpc;
1667         adapter->net_stats.rx_over_errors = adapter->stats.mpc;
1668
1669         adapter->net_stats.tx_errors = 0;
1670         adapter->net_stats.rx_frame_errors = 0;
1671         adapter->net_stats.tx_aborted_errors = 0;
1672         adapter->net_stats.tx_carrier_errors = 0;
1673         adapter->net_stats.tx_fifo_errors = 0;
1674         adapter->net_stats.tx_heartbeat_errors = 0;
1675         adapter->net_stats.tx_window_errors = 0;
1676 }
1677
1678 #define IXGB_MAX_INTR 10
1679 /**
1680  * ixgb_intr - Interrupt Handler
1681  * @irq: interrupt number
1682  * @data: pointer to a network interface device structure
1683  * @pt_regs: CPU registers structure
1684  **/
1685
1686 static irqreturn_t
1687 ixgb_intr(int irq, void *data, struct pt_regs *regs)
1688 {
1689         struct net_device *netdev = data;
1690         struct ixgb_adapter *adapter = netdev_priv(netdev);
1691         struct ixgb_hw *hw = &adapter->hw;
1692         uint32_t icr = IXGB_READ_REG(hw, ICR);
1693 #ifndef CONFIG_IXGB_NAPI
1694         unsigned int i;
1695 #endif
1696
1697         if(unlikely(!icr))
1698                 return IRQ_NONE;  /* Not our interrupt */
1699
1700         if(unlikely(icr & (IXGB_INT_RXSEQ | IXGB_INT_LSC))) {
1701                 mod_timer(&adapter->watchdog_timer, jiffies);
1702         }
1703
1704 #ifdef CONFIG_IXGB_NAPI
1705         if(netif_rx_schedule_prep(netdev)) {
1706
1707                 /* Disable interrupts and register for poll. The flush
1708                   of the posted write is intentionally left out.
1709                 */
1710
1711                 atomic_inc(&adapter->irq_sem);
1712                 IXGB_WRITE_REG(&adapter->hw, IMC, ~0);
1713                 __netif_rx_schedule(netdev);
1714         }
1715 #else
1716         /* yes, that is actually a & and it is meant to make sure that
1717          * every pass through this for loop checks both receive and
1718          * transmit queues for completed descriptors, intended to
1719          * avoid starvation issues and assist tx/rx fairness. */
1720         for(i = 0; i < IXGB_MAX_INTR; i++)
1721                 if(!ixgb_clean_rx_irq(adapter) &
1722                    !ixgb_clean_tx_irq(adapter))
1723                         break;
1724 #endif
1725         return IRQ_HANDLED;
1726 }
1727
1728 #ifdef CONFIG_IXGB_NAPI
1729 /**
1730  * ixgb_clean - NAPI Rx polling callback
1731  * @adapter: board private structure
1732  **/
1733
1734 static int
1735 ixgb_clean(struct net_device *netdev, int *budget)
1736 {
1737         struct ixgb_adapter *adapter = netdev_priv(netdev);
1738         int work_to_do = min(*budget, netdev->quota);
1739         int tx_cleaned;
1740         int work_done = 0;
1741
1742         tx_cleaned = ixgb_clean_tx_irq(adapter);
1743         ixgb_clean_rx_irq(adapter, &work_done, work_to_do);
1744
1745         *budget -= work_done;
1746         netdev->quota -= work_done;
1747
1748         /* if no Tx and not enough Rx work done, exit the polling mode */
1749         if((!tx_cleaned && (work_done == 0)) || !netif_running(netdev)) {
1750                 netif_rx_complete(netdev);
1751                 ixgb_irq_enable(adapter);
1752                 return 0;
1753         }
1754
1755         return 1;
1756 }
1757 #endif
1758
1759 /**
1760  * ixgb_clean_tx_irq - Reclaim resources after transmit completes
1761  * @adapter: board private structure
1762  **/
1763
1764 static boolean_t
1765 ixgb_clean_tx_irq(struct ixgb_adapter *adapter)
1766 {
1767         struct ixgb_desc_ring *tx_ring = &adapter->tx_ring;
1768         struct net_device *netdev = adapter->netdev;
1769         struct ixgb_tx_desc *tx_desc, *eop_desc;
1770         struct ixgb_buffer *buffer_info;
1771         unsigned int i, eop;
1772         boolean_t cleaned = FALSE;
1773
1774         i = tx_ring->next_to_clean;
1775         eop = tx_ring->buffer_info[i].next_to_watch;
1776         eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1777
1778         while(eop_desc->status & IXGB_TX_DESC_STATUS_DD) {
1779
1780                 for(cleaned = FALSE; !cleaned; ) {
1781                         tx_desc = IXGB_TX_DESC(*tx_ring, i);
1782                         buffer_info = &tx_ring->buffer_info[i];
1783
1784                         if (tx_desc->popts
1785                             & (IXGB_TX_DESC_POPTS_TXSM |
1786                                IXGB_TX_DESC_POPTS_IXSM))
1787                                 adapter->hw_csum_tx_good++;
1788
1789                         ixgb_unmap_and_free_tx_resource(adapter, buffer_info);
1790
1791                         *(uint32_t *)&(tx_desc->status) = 0;
1792
1793                         cleaned = (i == eop);
1794                         if(++i == tx_ring->count) i = 0;
1795                 }
1796
1797                 eop = tx_ring->buffer_info[i].next_to_watch;
1798                 eop_desc = IXGB_TX_DESC(*tx_ring, eop);
1799         }
1800
1801         tx_ring->next_to_clean = i;
1802
1803         if (unlikely(netif_queue_stopped(netdev))) {
1804                 spin_lock(&adapter->tx_lock);
1805                 if (netif_queue_stopped(netdev) && netif_carrier_ok(netdev) &&
1806                     (IXGB_DESC_UNUSED(tx_ring) > IXGB_TX_QUEUE_WAKE))
1807                         netif_wake_queue(netdev);
1808                 spin_unlock(&adapter->tx_lock);
1809         }
1810
1811         if(adapter->detect_tx_hung) {
1812                 /* detect a transmit hang in hardware, this serializes the
1813                  * check with the clearing of time_stamp and movement of i */
1814                 adapter->detect_tx_hung = FALSE;
1815                 if (tx_ring->buffer_info[eop].dma &&
1816                    time_after(jiffies, tx_ring->buffer_info[eop].time_stamp + HZ)
1817                    && !(IXGB_READ_REG(&adapter->hw, STATUS) &
1818                         IXGB_STATUS_TXOFF)) {
1819                         /* detected Tx unit hang */
1820                         DPRINTK(DRV, ERR, "Detected Tx Unit Hang\n"
1821                                         "  TDH                  <%x>\n"
1822                                         "  TDT                  <%x>\n"
1823                                         "  next_to_use          <%x>\n"
1824                                         "  next_to_clean        <%x>\n"
1825                                         "buffer_info[next_to_clean]\n"
1826                                         "  time_stamp           <%lx>\n"
1827                                         "  next_to_watch        <%x>\n"
1828                                         "  jiffies              <%lx>\n"
1829                                         "  next_to_watch.status <%x>\n",
1830                                 IXGB_READ_REG(&adapter->hw, TDH),
1831                                 IXGB_READ_REG(&adapter->hw, TDT),
1832                                 tx_ring->next_to_use,
1833                                 tx_ring->next_to_clean,
1834                                 tx_ring->buffer_info[eop].time_stamp,
1835                                 eop,
1836                                 jiffies,
1837                                 eop_desc->status);
1838                         netif_stop_queue(netdev);
1839                 }
1840         }
1841
1842         return cleaned;
1843 }
1844
1845 /**
1846  * ixgb_rx_checksum - Receive Checksum Offload for 82597.
1847  * @adapter: board private structure
1848  * @rx_desc: receive descriptor
1849  * @sk_buff: socket buffer with received data
1850  **/
1851
1852 static void
1853 ixgb_rx_checksum(struct ixgb_adapter *adapter,
1854                  struct ixgb_rx_desc *rx_desc,
1855                  struct sk_buff *skb)
1856 {
1857         /* Ignore Checksum bit is set OR
1858          * TCP Checksum has not been calculated
1859          */
1860         if((rx_desc->status & IXGB_RX_DESC_STATUS_IXSM) ||
1861            (!(rx_desc->status & IXGB_RX_DESC_STATUS_TCPCS))) {
1862                 skb->ip_summed = CHECKSUM_NONE;
1863                 return;
1864         }
1865
1866         /* At this point we know the hardware did the TCP checksum */
1867         /* now look at the TCP checksum error bit */
1868         if(rx_desc->errors & IXGB_RX_DESC_ERRORS_TCPE) {
1869                 /* let the stack verify checksum errors */
1870                 skb->ip_summed = CHECKSUM_NONE;
1871                 adapter->hw_csum_rx_error++;
1872         } else {
1873                 /* TCP checksum is good */
1874                 skb->ip_summed = CHECKSUM_UNNECESSARY;
1875                 adapter->hw_csum_rx_good++;
1876         }
1877 }
1878
1879 /**
1880  * ixgb_clean_rx_irq - Send received data up the network stack,
1881  * @adapter: board private structure
1882  **/
1883
1884 static boolean_t
1885 #ifdef CONFIG_IXGB_NAPI
1886 ixgb_clean_rx_irq(struct ixgb_adapter *adapter, int *work_done, int work_to_do)
1887 #else
1888 ixgb_clean_rx_irq(struct ixgb_adapter *adapter)
1889 #endif
1890 {
1891         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
1892         struct net_device *netdev = adapter->netdev;
1893         struct pci_dev *pdev = adapter->pdev;
1894         struct ixgb_rx_desc *rx_desc, *next_rxd;
1895         struct ixgb_buffer *buffer_info, *next_buffer, *next2_buffer;
1896         uint32_t length;
1897         unsigned int i, j;
1898         boolean_t cleaned = FALSE;
1899
1900         i = rx_ring->next_to_clean;
1901         rx_desc = IXGB_RX_DESC(*rx_ring, i);
1902         buffer_info = &rx_ring->buffer_info[i];
1903
1904         while(rx_desc->status & IXGB_RX_DESC_STATUS_DD) {
1905                 struct sk_buff *skb, *next_skb;
1906                 u8 status;
1907
1908 #ifdef CONFIG_IXGB_NAPI
1909                 if(*work_done >= work_to_do)
1910                         break;
1911
1912                 (*work_done)++;
1913 #endif
1914                 status = rx_desc->status;
1915                 skb = buffer_info->skb;
1916                 buffer_info->skb = NULL;
1917
1918                 prefetch(skb->data);
1919
1920                 if(++i == rx_ring->count) i = 0;
1921                 next_rxd = IXGB_RX_DESC(*rx_ring, i);
1922                 prefetch(next_rxd);
1923
1924                 if((j = i + 1) == rx_ring->count) j = 0;
1925                 next2_buffer = &rx_ring->buffer_info[j];
1926                 prefetch(next2_buffer);
1927
1928                 next_buffer = &rx_ring->buffer_info[i];
1929                 next_skb = next_buffer->skb;
1930                 prefetch(next_skb);
1931
1932                 cleaned = TRUE;
1933
1934                 pci_unmap_single(pdev,
1935                                  buffer_info->dma,
1936                                  buffer_info->length,
1937                                  PCI_DMA_FROMDEVICE);
1938
1939                 length = le16_to_cpu(rx_desc->length);
1940
1941                 if(unlikely(!(status & IXGB_RX_DESC_STATUS_EOP))) {
1942
1943                         /* All receives must fit into a single buffer */
1944
1945                         IXGB_DBG("Receive packet consumed multiple buffers "
1946                                          "length<%x>\n", length);
1947
1948                         dev_kfree_skb_irq(skb);
1949                         goto rxdesc_done;
1950                 }
1951
1952                 if (unlikely(rx_desc->errors
1953                              & (IXGB_RX_DESC_ERRORS_CE | IXGB_RX_DESC_ERRORS_SE
1954                                 | IXGB_RX_DESC_ERRORS_P |
1955                                 IXGB_RX_DESC_ERRORS_RXE))) {
1956
1957                         dev_kfree_skb_irq(skb);
1958                         goto rxdesc_done;
1959                 }
1960
1961                 /* code added for copybreak, this should improve
1962                  * performance for small packets with large amounts
1963                  * of reassembly being done in the stack */
1964 #define IXGB_CB_LENGTH 256
1965                 if (length < IXGB_CB_LENGTH) {
1966                         struct sk_buff *new_skb =
1967                             dev_alloc_skb(length + NET_IP_ALIGN);
1968                         if (new_skb) {
1969                                 skb_reserve(new_skb, NET_IP_ALIGN);
1970                                 new_skb->dev = netdev;
1971                                 memcpy(new_skb->data - NET_IP_ALIGN,
1972                                        skb->data - NET_IP_ALIGN,
1973                                        length + NET_IP_ALIGN);
1974                                 /* save the skb in buffer_info as good */
1975                                 buffer_info->skb = skb;
1976                                 skb = new_skb;
1977                         }
1978                 }
1979                 /* end copybreak code */
1980
1981                 /* Good Receive */
1982                 skb_put(skb, length);
1983
1984                 /* Receive Checksum Offload */
1985                 ixgb_rx_checksum(adapter, rx_desc, skb);
1986
1987                 skb->protocol = eth_type_trans(skb, netdev);
1988 #ifdef CONFIG_IXGB_NAPI
1989                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1990                         vlan_hwaccel_receive_skb(skb, adapter->vlgrp,
1991                                 le16_to_cpu(rx_desc->special) &
1992                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
1993                 } else {
1994                         netif_receive_skb(skb);
1995                 }
1996 #else /* CONFIG_IXGB_NAPI */
1997                 if(adapter->vlgrp && (status & IXGB_RX_DESC_STATUS_VP)) {
1998                         vlan_hwaccel_rx(skb, adapter->vlgrp,
1999                                 le16_to_cpu(rx_desc->special) &
2000                                         IXGB_RX_DESC_SPECIAL_VLAN_MASK);
2001                 } else {
2002                         netif_rx(skb);
2003                 }
2004 #endif /* CONFIG_IXGB_NAPI */
2005                 netdev->last_rx = jiffies;
2006
2007 rxdesc_done:
2008                 /* clean up descriptor, might be written over by hw */
2009                 rx_desc->status = 0;
2010
2011                 /* use prefetched values */
2012                 rx_desc = next_rxd;
2013                 buffer_info = next_buffer;
2014         }
2015
2016         rx_ring->next_to_clean = i;
2017
2018         ixgb_alloc_rx_buffers(adapter);
2019
2020         return cleaned;
2021 }
2022
2023 /**
2024  * ixgb_alloc_rx_buffers - Replace used receive buffers
2025  * @adapter: address of board private structure
2026  **/
2027
2028 static void
2029 ixgb_alloc_rx_buffers(struct ixgb_adapter *adapter)
2030 {
2031         struct ixgb_desc_ring *rx_ring = &adapter->rx_ring;
2032         struct net_device *netdev = adapter->netdev;
2033         struct pci_dev *pdev = adapter->pdev;
2034         struct ixgb_rx_desc *rx_desc;
2035         struct ixgb_buffer *buffer_info;
2036         struct sk_buff *skb;
2037         unsigned int i;
2038         int num_group_tail_writes;
2039         long cleancount;
2040
2041         i = rx_ring->next_to_use;
2042         buffer_info = &rx_ring->buffer_info[i];
2043         cleancount = IXGB_DESC_UNUSED(rx_ring);
2044
2045         num_group_tail_writes = IXGB_RX_BUFFER_WRITE;
2046
2047         /* leave three descriptors unused */
2048         while(--cleancount > 2) {
2049                 /* recycle! its good for you */
2050                 if (!(skb = buffer_info->skb))
2051                         skb = dev_alloc_skb(adapter->rx_buffer_len
2052                                             + NET_IP_ALIGN);
2053                 else {
2054                         skb_trim(skb, 0);
2055                         goto map_skb;
2056                 }
2057
2058                 if (unlikely(!skb)) {
2059                         /* Better luck next round */
2060                         adapter->alloc_rx_buff_failed++;
2061                         break;
2062                 }
2063
2064                 /* Make buffer alignment 2 beyond a 16 byte boundary
2065                  * this will result in a 16 byte aligned IP header after
2066                  * the 14 byte MAC header is removed
2067                  */
2068                 skb_reserve(skb, NET_IP_ALIGN);
2069
2070                 skb->dev = netdev;
2071
2072                 buffer_info->skb = skb;
2073                 buffer_info->length = adapter->rx_buffer_len;
2074 map_skb:
2075                 buffer_info->dma = pci_map_single(pdev,
2076                                                   skb->data,
2077                                                   adapter->rx_buffer_len,
2078                                                   PCI_DMA_FROMDEVICE);
2079
2080                 rx_desc = IXGB_RX_DESC(*rx_ring, i);
2081                 rx_desc->buff_addr = cpu_to_le64(buffer_info->dma);
2082                 /* guarantee DD bit not set now before h/w gets descriptor
2083                  * this is the rest of the workaround for h/w double
2084                  * writeback. */
2085                 rx_desc->status = 0;
2086
2087
2088                 if(++i == rx_ring->count) i = 0;
2089                 buffer_info = &rx_ring->buffer_info[i];
2090         }
2091
2092         if (likely(rx_ring->next_to_use != i)) {
2093                 rx_ring->next_to_use = i;
2094                 if (unlikely(i-- == 0))
2095                         i = (rx_ring->count - 1);
2096
2097                 /* Force memory writes to complete before letting h/w
2098                  * know there are new descriptors to fetch.  (Only
2099                  * applicable for weak-ordered memory model archs, such
2100                  * as IA-64). */
2101                 wmb();
2102                 IXGB_WRITE_REG(&adapter->hw, RDT, i);
2103         }
2104 }
2105
2106 /**
2107  * ixgb_vlan_rx_register - enables or disables vlan tagging/stripping.
2108  *
2109  * @param netdev network interface device structure
2110  * @param grp indicates to enable or disable tagging/stripping
2111  **/
2112 static void
2113 ixgb_vlan_rx_register(struct net_device *netdev, struct vlan_group *grp)
2114 {
2115         struct ixgb_adapter *adapter = netdev_priv(netdev);
2116         uint32_t ctrl, rctl;
2117
2118         ixgb_irq_disable(adapter);
2119         adapter->vlgrp = grp;
2120
2121         if(grp) {
2122                 /* enable VLAN tag insert/strip */
2123                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2124                 ctrl |= IXGB_CTRL0_VME;
2125                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2126
2127                 /* enable VLAN receive filtering */
2128
2129                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2130                 rctl |= IXGB_RCTL_VFE;
2131                 rctl &= ~IXGB_RCTL_CFIEN;
2132                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2133         } else {
2134                 /* disable VLAN tag insert/strip */
2135
2136                 ctrl = IXGB_READ_REG(&adapter->hw, CTRL0);
2137                 ctrl &= ~IXGB_CTRL0_VME;
2138                 IXGB_WRITE_REG(&adapter->hw, CTRL0, ctrl);
2139
2140                 /* disable VLAN filtering */
2141
2142                 rctl = IXGB_READ_REG(&adapter->hw, RCTL);
2143                 rctl &= ~IXGB_RCTL_VFE;
2144                 IXGB_WRITE_REG(&adapter->hw, RCTL, rctl);
2145         }
2146
2147         ixgb_irq_enable(adapter);
2148 }
2149
2150 static void
2151 ixgb_vlan_rx_add_vid(struct net_device *netdev, uint16_t vid)
2152 {
2153         struct ixgb_adapter *adapter = netdev_priv(netdev);
2154         uint32_t vfta, index;
2155
2156         /* add VID to filter table */
2157
2158         index = (vid >> 5) & 0x7F;
2159         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2160         vfta |= (1 << (vid & 0x1F));
2161         ixgb_write_vfta(&adapter->hw, index, vfta);
2162 }
2163
2164 static void
2165 ixgb_vlan_rx_kill_vid(struct net_device *netdev, uint16_t vid)
2166 {
2167         struct ixgb_adapter *adapter = netdev_priv(netdev);
2168         uint32_t vfta, index;
2169
2170         ixgb_irq_disable(adapter);
2171
2172         if(adapter->vlgrp)
2173                 adapter->vlgrp->vlan_devices[vid] = NULL;
2174
2175         ixgb_irq_enable(adapter);
2176
2177         /* remove VID from filter table*/
2178
2179         index = (vid >> 5) & 0x7F;
2180         vfta = IXGB_READ_REG_ARRAY(&adapter->hw, VFTA, index);
2181         vfta &= ~(1 << (vid & 0x1F));
2182         ixgb_write_vfta(&adapter->hw, index, vfta);
2183 }
2184
2185 static void
2186 ixgb_restore_vlan(struct ixgb_adapter *adapter)
2187 {
2188         ixgb_vlan_rx_register(adapter->netdev, adapter->vlgrp);
2189
2190         if(adapter->vlgrp) {
2191                 uint16_t vid;
2192                 for(vid = 0; vid < VLAN_GROUP_ARRAY_LEN; vid++) {
2193                         if(!adapter->vlgrp->vlan_devices[vid])
2194                                 continue;
2195                         ixgb_vlan_rx_add_vid(adapter->netdev, vid);
2196                 }
2197         }
2198 }
2199
2200 #ifdef CONFIG_NET_POLL_CONTROLLER
2201 /*
2202  * Polling 'interrupt' - used by things like netconsole to send skbs
2203  * without having to re-enable interrupts. It's not called while
2204  * the interrupt routine is executing.
2205  */
2206
2207 static void ixgb_netpoll(struct net_device *dev)
2208 {
2209         struct ixgb_adapter *adapter = dev->priv;
2210
2211         disable_irq(adapter->pdev->irq);
2212         ixgb_intr(adapter->pdev->irq, dev, NULL);
2213         enable_irq(adapter->pdev->irq);
2214 }
2215 #endif
2216
2217 /* ixgb_main.c */